Patent US4150704A successfully refreshed from Google Patents.
US4150704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing sand mounds having a frozen surface
Assignee: Dansk Industri Syndikat AS
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Filing: 1978-07-21
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Granted: 1979-04-24
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Expires: 1998-07-21
Abstract
Abstract A method of producing a mould of particulate material comprises admixing the particulate material with a controlled quantity of water, compacting the mixture to the required shape on a pattern or the like, removing the compacted mass from the pattern, and directing at at least the surface of the compacted mould to be contacted by molten metal a stream of coolant, whereby at least that surface is frozen to a depth sufficient to withstand the conditions imposed during the pouring of molten metal into the mould.
Inventors
- 👤 Frederick H. Hoult
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:59
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/12; B22C9/126
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
88 words
A method or producing a mould of particulate material comprising admixing the particulate material with a controlled quantity of water, compacting the mixture to the required shape on a pattern or the like, removing the compacted mass from the pattern, and then directing at at least the surface of the removed, compacted mould to be contacted by molten metal a stream of coolant, whereby at least that surface is frozen to a depth sufficient to withstand the conditions imposed during the pouring of molten metal into the mould.
Claim 2
Independent Claim
88 words
A method or producing a mould of particulate material comprising admixing the particulate material with a controlled quantity of water, compacting the mixture to the required shape on a pattern or the like, removing the compacted mass from the pattern, and then directing at at least the surface of the removed, compacted mould to be contacted by molten metal a stream of coolant, whereby at least that surface is frozen to a depth sufficient to withstand the conditions imposed during the pouring of molten metal into the mould.
Claim 3
Dependent Claim
55 words
A method as in claim 1 wherein, the mixture prior to compaction is provided with a relatively small amount of a material which does not affect reclamation of the sand and which is capable of giving the compacted mixture a preliminary bond of sufficient green strength to allow it to be stripped from the pattern.
Claim 4
Dependent Claim
29 words
A method as in claim 1, wherein the coolant is air, cooled at a temperature such that on directing the air against the mould, the mould surface is frozen.
Claim 5
Dependent Claim
24 words
A method as in claim 1, wherein the coolant is provided by a source of liquified gas such as nitrogen, carbon dioxide or helium.
Claim 6
Dependent Claim
20 words
A method as in claim 1, wherein the particulate material has a water content of up to 12% by weight.
Claim 7
Dependent Claim
12 words
A method as in claim 1, wherein the mould is completely frozen.
Claim 8
Dependent Claim
19 words
A method as in claim 1, wherein the mould is frozen in the range -1° C. to -269° C.
Claim 9
Dependent Claim
66 words
A method as in claim 7, wherein the mould is frozen such that at least the surface of the mould to be contacted by molten metal has a temperature below -20° C., and prior to casting allowing the mould to warm up such that at least that surface has a temperature of -10° C. to -20° C. at the point in time that casting takes place.
Claim 10
Dependent Claim
15 words
A method as in claim 1, wherein the particulate mould making material is silica sand.
Claim 11
Dependent Claim
15 words
A method as in claim 1, wherein the particulate mould making material is zircon sand.
Claim 12
Dependent Claim
15 words
A method as in claim 1, wherein the particulate mould making material is olivine sand.
Claim 13
Dependent Claim
37 words
A method as in claim 1, wherein the mould making batch comprises 88% to 99% by weight of particulate mould forming material, 1% to 12% by weight water and 1% to 4% by weight of a binder.
Claim 14
Dependent Claim
17 words
A method as in claim 1, wherein the pattern is of metal provided with a non-corrosive surface.
Claim 15
Dependent Claim
16 words
A method as in claim 1, wherein the pattern is wood having a water proofed surface.
Claim 16
Dependent Claim
13 words
A method as in claim 1, wherein the pattern is of synthetic resin.
Claim 17
Dependent Claim
55 words
A method as in claim 1, wherein once the mould making batch has been compacted on the pattern, a flat base plate of a light metal alloy is placed on the exposed back surface of the mould and the assembly turned over so that the weight of the mould is supported by the base plate.
Claim 18
Dependent Claim
13 words
A method as in claim 16, wherein a flat base plate is perforated.
Claim 19
Independent Claim
87 words
A method of producing a mould of particulate material comprising admixing the particulate material with a further material capable of providing a preliminary bond, compacting the mixture to the required shape on a pattern or the like, removing the compacted mass from the pattern then providing the compacted mass with a primary bond by directing at at least the surface of the removed compacted mould to be contacted by molten metal a stream of coolant, whereby at least that surface is frozen to create the primary bond.
Claim 20
Independent Claim
87 words
A method of producing a mould of particulate material comprising admixing the particulate material with a further material capable of providing a preliminary bond, compacting the mixture to the required shape on a pattern or the like, removing the compacted mass from the pattern then providing the compacted mass with a primary bond by directing at at least the surface of the removed compacted mould to be contacted by molten metal a stream of coolant, whereby at least that surface is frozen to create the primary bond.
Claim 21
Dependent Claim
36 words
A method as in claim 18, wherein the nature of the material providing in the preliminary bond is such as to provide the mould with a secondary bond when molten metal is poured into the mould.
Claim 22
Dependent Claim
15 words
A method as in claim 19, wherein starch is included in a mould making batch.
Claim 23
Dependent Claim
15 words
A method as in claim 19, wherein bentonite is included in a mould making batch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |